One collection, Maxon & Harvey 8092 (US), has calycine lobes to 4 mm long; these are obtuse at the apex. In other respects it resembles the Panamanian material of Hillia tetrandra. Mori & Kallunki 5815 notes, "flower not opened when collected at 5:00 p.m. but opened in bag by 7:00 p.m. Moth pollinated?"